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    <script>
        // 写一个求和的函数 sum， 达到下面的效果
        // Should equal 15 
        sum(1, 2, 3, 4, 5);
        // Should equal 0 
        sum(5, null, -5);
        // Should equal 10 
        sum('1.0', false, 1, true, 1, 'A', 1, 'B', 1, 'C', 1, 'D', 1, 'E', 1, 'F', 1, 'G', 1);
        // Should equal 0.3, not 0.30000000000000004
        sum(0.1, 0.2);

        
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